Brentford striker Clayton Donaldson says he witnessed the on-field tensions during Sunday's fourth round tie. The Blues were twice behind and required a late Torres strike to claim a 2-2 draw and a replay.

Asked if he had witnessed Chelsea’s
players becoming agitated on the pitch, Donaldson told the Guardian: 'Absolutely. I
was obviously closer to Ashley. He was always mumbling something, always
mumbling stuff quietly, but I could still hear what he was saying. He
was just getting frustrated. He was saying about the forward players not
showing, saying things like ‘He needs to be there’ and pointing. You
could just see straight away that he was getting frustrated. That was a
good thing.

'We are confident. That (atmosphere at
Stamford Bridge) has played a part in their recent form. Obviously the
fans are unhappy with the manager – they don’t really like him – so any
little thing that goes wrong, they’re always on their backs. I think
that has played a part in their recent results so, hopefully, we can put
that to our advantage and the take the positives and unrest their fans
again at their place.'

Scare: Chelsea needed a late equaliser from Fernando Torres to earn a replay

The two games against the Premier
League club could end up earning Brentford around £1m, a vital injection
of funds at a club that recently revealed it had recorded a loss of £5m
for 2012.

Donaldson added: 'You couldn’t
really see that they were European champions. We set out to unsettle
them, and we did that. They didn’t really create that many chances,
which I am very surprised about to be honest, especially with the
quality of players they have got. That was down to our hard work.

'We’d
done our homework on them and we stopped them creating. We have to take
some credit for that. We’re confident, especially given their run of
form at home recently not having been the best. The pressure will be on
them again.'